Remove obsolete MC test code.
Remove obsolete MC test code.

This was designed to test continuity between the various edge
 interpolation types.
Since we no longer support CGI, there is only one edge type.
Technically, we could still repurpose this test to check for
 continuity between OBMC blending when adjacent block sizes differ,
 but that would require redesigning the test, and would have to be
 reworked when support for adjacent blocks that differ by more than
 one size level is added.

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